1config EXT4_FS
 2	tristate "The Extended 4 (ext4) filesystem"
 
 3	select JBD2
 4	select CRC16
 5	select CRYPTO
 6	select CRYPTO_CRC32C
 7	help
 8	  This is the next generation of the ext3 filesystem.
 9
10	  Unlike the change from ext2 filesystem to ext3 filesystem,
11	  the on-disk format of ext4 is not forwards compatible with
12	  ext3; it is based on extent maps and it supports 48-bit
13	  physical block numbers.  The ext4 filesystem also supports delayed
14	  allocation, persistent preallocation, high resolution time stamps,
15	  and a number of other features to improve performance and speed
16	  up fsck time.  For more information, please see the web pages at
17	  http://ext4.wiki.kernel.org.
18
19	  The ext4 filesystem will support mounting an ext3
20	  filesystem; while there will be some performance gains from
21	  the delayed allocation and inode table readahead, the best
22	  performance gains will require enabling ext4 features in the
23	  filesystem, or formatting a new filesystem as an ext4
24	  filesystem initially.
 
25
26	  To compile this file system support as a module, choose M here. The
27	  module will be called ext4.
28
29	  If unsure, say N.
30
31config EXT4_USE_FOR_EXT23
32	bool "Use ext4 for ext2/ext3 file systems"
33	depends on EXT4_FS
34	depends on EXT3_FS=n || EXT2_FS=n
35	default y
36	help
37	  Allow the ext4 file system driver code to be used for ext2 or
38	  ext3 file system mounts.  This allows users to reduce their
39	  compiled kernel size by using one file system driver for
40	  ext2, ext3, and ext4 file systems.
41
42config EXT4_FS_XATTR
43	bool "Ext4 extended attributes"
44	depends on EXT4_FS
45	default y
46	help
47	  Extended attributes are name:value pairs associated with inodes by
48	  the kernel or by users (see the attr(5) manual page, or visit
49	  <http://acl.bestbits.at/> for details).
50
51	  If unsure, say N.
52
53	  You need this for POSIX ACL support on ext4.
54
55config EXT4_FS_POSIX_ACL
56	bool "Ext4 POSIX Access Control Lists"
57	depends on EXT4_FS_XATTR
58	select FS_POSIX_ACL
59	help
60	  POSIX Access Control Lists (ACLs) support permissions for users and
61	  groups beyond the owner/group/world scheme.
62
63	  To learn more about Access Control Lists, visit the POSIX ACLs for
64	  Linux website <http://acl.bestbits.at/>.
65
66	  If you don't know what Access Control Lists are, say N
67
68config EXT4_FS_SECURITY
69	bool "Ext4 Security Labels"
70	depends on EXT4_FS_XATTR
71	help
72	  Security labels support alternative access control models
73	  implemented by security modules like SELinux.  This option
74	  enables an extended attribute handler for file security
75	  labels in the ext4 filesystem.
76
77	  If you are not using a security module that requires using
78	  extended attributes for file security labels, say N.
79
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
80config EXT4_DEBUG
81	bool "EXT4 debugging support"
82	depends on EXT4_FS
83	help
84	  Enables run-time debugging support for the ext4 filesystem.
85
86	  If you select Y here, then you will be able to turn on debugging
87	  with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"
 

  1# Ext3 configs are here for backward compatibility with old configs which may
  2# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
  3# kernels after the removal of ext3 driver.
  4config EXT3_FS
  5	tristate "The Extended 3 (ext3) filesystem"
  6	# These must match EXT4_FS selects...
  7	select EXT4_FS
  8	select JBD2
  9	select CRC16
 10	select CRYPTO
 11	select CRYPTO_CRC32C
 12	help
 13	  This config option is here only for backward compatibility. ext3
 14	  filesystem is now handled by the ext4 driver.
 15
 16config EXT3_FS_POSIX_ACL
 17	bool "Ext3 POSIX Access Control Lists"
 18	depends on EXT3_FS
 19	select EXT4_FS_POSIX_ACL
 20	select FS_POSIX_ACL
 21	help
 22	  This config option is here only for backward compatibility. ext3
 23	  filesystem is now handled by the ext4 driver.
 24
 25config EXT3_FS_SECURITY
 26	bool "Ext3 Security Labels"
 27	depends on EXT3_FS
 28	select EXT4_FS_SECURITY
 29	help
 30	  This config option is here only for backward compatibility. ext3
 31	  filesystem is now handled by the ext4 driver.
 32
 33config EXT4_FS
 34	tristate "The Extended 4 (ext4) filesystem"
 35	# Please update EXT3_FS selects when changing these
 36	select JBD2
 37	select CRC16
 38	select CRYPTO
 39	select CRYPTO_CRC32C
 40	help
 41	  This is the next generation of the ext3 filesystem.
 42
 43	  Unlike the change from ext2 filesystem to ext3 filesystem,
 44	  the on-disk format of ext4 is not forwards compatible with
 45	  ext3; it is based on extent maps and it supports 48-bit
 46	  physical block numbers.  The ext4 filesystem also supports delayed
 47	  allocation, persistent preallocation, high resolution time stamps,
 48	  and a number of other features to improve performance and speed
 49	  up fsck time.  For more information, please see the web pages at
 50	  http://ext4.wiki.kernel.org.
 51
 52	  The ext4 filesystem supports mounting an ext3 filesystem; while there
 53	  are some performance gains from the delayed allocation and inode
 54	  table readahead, the best performance gains require enabling ext4
 55	  features in the filesystem using tune2fs, or formatting a new
 56	  filesystem as an ext4 filesystem initially. Without explicit enabling
 57	  of ext4 features, the on disk filesystem format stays fully backward
 58	  compatible.
 59
 60	  To compile this file system support as a module, choose M here. The
 61	  module will be called ext4.
 62
 63	  If unsure, say N.
 64
 65config EXT4_USE_FOR_EXT2
 66	bool "Use ext4 for ext2 file systems"
 67	depends on EXT4_FS
 68	depends on EXT2_FS=n
 69	default y
 70	help
 71	  Allow the ext4 file system driver code to be used for ext2
 72	  file system mounts.  This allows users to reduce their
 73	  compiled kernel size by using one file system driver for
 74	  ext2, ext3, and ext4 file systems.
 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 76config EXT4_FS_POSIX_ACL
 77	bool "Ext4 POSIX Access Control Lists"
 78	depends on EXT4_FS
 79	select FS_POSIX_ACL
 80	help
 81	  POSIX Access Control Lists (ACLs) support permissions for users and
 82	  groups beyond the owner/group/world scheme.
 83
 84	  To learn more about Access Control Lists, visit the POSIX ACLs for
 85	  Linux website <http://acl.bestbits.at/>.
 86
 87	  If you don't know what Access Control Lists are, say N
 88
 89config EXT4_FS_SECURITY
 90	bool "Ext4 Security Labels"
 91	depends on EXT4_FS
 92	help
 93	  Security labels support alternative access control models
 94	  implemented by security modules like SELinux.  This option
 95	  enables an extended attribute handler for file security
 96	  labels in the ext4 filesystem.
 97
 98	  If you are not using a security module that requires using
 99	  extended attributes for file security labels, say N.
100
101config EXT4_ENCRYPTION
102	tristate "Ext4 Encryption"
103	depends on EXT4_FS
104	select CRYPTO_AES
105	select CRYPTO_CBC
106	select CRYPTO_ECB
107	select CRYPTO_XTS
108	select CRYPTO_CTS
109	select CRYPTO_CTR
110	select CRYPTO_SHA256
111	select KEYS
112	select ENCRYPTED_KEYS
113	help
114	  Enable encryption of ext4 files and directories.  This
115	  feature is similar to ecryptfs, but it is more memory
116	  efficient since it avoids caching the encrypted and
117	  decrypted pages in the page cache.
118
119config EXT4_FS_ENCRYPTION
120	bool
121	default y
122	depends on EXT4_ENCRYPTION
123
124config EXT4_DEBUG
125	bool "EXT4 debugging support"
126	depends on EXT4_FS
127	help
128	  Enables run-time debugging support for the ext4 filesystem.
129
130	  If you select Y here, then you will be able to turn on debugging
131	  with a command such as:
132		echo 1 > /sys/module/ext4/parameters/mballoc_debug